Tens of thousands gathered on Saturday to mark 50 years since the
March on Washington, the civil rights watershed where Martin
Luther King Jr famously declared: "I have a dream."

Under blue skies, the predominantly - but by no means exclusively
- African American crowd swelled around the Reflecting Pool,
cheering a procession of speakers who addressed them from the
white marble steps of the Lincoln Memorial.

"This is not a time for nostalgic commemoration... The task is
not done. The journey is not complete. We can and we must do
more," said King's son Martin Luther King III, speaking from the
precise spot where his father delivered one of American history's
greatest speeches.

"Fifty years ago, my father stood upon this hallowed spot and the
spirit of God spoke through him... I can almost hear my father
humming, 'A train's a-coming'," he said.

"Their march is now our march, and it must go on," echoed
Attorney General Eric Holder, honoring the estimated 250,000 who
assembled on the National Mall in sweltering heat on August 28,
1963 to denounce racial segregation and demand equal rights.

"Today we look to the work that remains unfinished," Holder said.
"We want this nation to be all it was designed to be, and all it
can be."

Organizers had planned for as many as 150,000 people to attend
Saturday's mass rally and afternoon march to the nearby Martin
Luther King Jr monument, ahead of another commemorative march
Wednesday to be addressed by President Barack Obama.

The March on Washington is best remembered for King's stirring
vision of a United States free of inequality and prejudice,
telecast live to a nation undergoing a phenomenal decade of
soul-searching, crisis and change.

Saturday's event,spearheaded by civil rights firebrand Reverend
Al Sharpton with prominent trade-union backing, underscored a
fresh list of concerns, from income inequality and threats to
voting rights to immigration reform and urban violence.

"We have another fight. We must stand up and fight the good
fight... We are one people. We are one house. We all live in the
same house," said Congressman John Lewis of Georgia,returning to
the exact spot where he addressed the March on Washington as a
23-year-old a half-century earlier.

"We cannot go back. We have come too far... We can not give in."

His feelings were shared in the largely middle-aged crowd which,
in the front rows, held up signs condemning racial profiling and
demanding statehood for the District of Columbia, which has no
voting member of Congress.

"We have not progressed. We're going backwards, I'd say, in the
last 20 years," said Vera Peele of South Bend, Indiana, who
expressed concern about the ability of the frail senior citizens
she helps look after to access voting stations.

"We're getting away from what really matters, and that's the
people," added mother-of-six Tameka Johnson of Scotland Neck,
North Carolina, a teaching assistant worried about the impact of
educational cutbacks in her Southern state.

Marjorie Ross of Springfield, Massachusetts, was part of a group
that traveled overnight for seven hours to find itself
unexpectedly at the very front of the crowd that stretched back
to the Washington Monument with the Capitol in the distance.

"My grandmother came in 1963. I picked up the torch to be here
for her," said Ross, who was 13 back then. "As a kid I endured a
lot of injustice, and I'm sure it was because of the color of my
skin."